US6512652B1 - Power saving method and apparatus for computer disk drives - Google Patents

Power saving method and apparatus for computer disk drives Download PDF

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Publication number
US6512652B1
US6512652B1 US08/608,974 US60897496A US6512652B1 US 6512652 B1 US6512652 B1 US 6512652B1 US 60897496 A US60897496 A US 60897496A US 6512652 B1 US6512652 B1 US 6512652B1
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Prior art keywords
head
disk
spindle motor
data
disk drive
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US08/608,974
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English (en)
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Dwight Quentin Nelson
Daniel James Winarski
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MediaTek Inc
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International Business Machines Corp
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Assigned to MEDIATEK INC. reassignment MEDIATEK INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL BUSINESS MACHINES CORPORATION
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/20—Driving; Starting; Stopping; Control thereof
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3206—Monitoring of events, devices or parameters that trigger a change in power modality
    • G06F1/3215—Monitoring of peripheral devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/325—Power saving in peripheral device
    • G06F1/3268—Power saving in hard disk drive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/06—Control of operating function, e.g. switching from recording to reproducing by counting or timing of machine operations
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate

Definitions

  • the present invention relates to computer memory disk devices in which the speed of rotation is controlled, and particularly to reducing power consumption of multi-speed constant linear velocity and multi-speed constant angular velocity disk drives.
  • the system is capable of reducing wear by slightly displacing the head two or three tracks and lifting the head when the disk is started. Power is saved by reducing the drag effect of the head inadvertently contracting the disk or start-up; however, the apparatus and method are not useful to save power when a disk is already in motion.
  • U.S. Pat. No. 4,658,308 to Sander discloses a method and apparatus for moving a head to a safe “home” position under microprocessor control when it is sensed that power to a rotating disk is to be interrupted. Slight savings in power are probably realized by reducing any inadvertent drag effects that would result if the head interfered with the disk rotation. However, the method and apparatus are ineffective to save power while a disk is spinning in a useful operation.
  • An objective of the present invention is to reduce the power consumption of an optical disk device without significantly degrading response time to a command to seek data.
  • Another objective of the present invention is to provide an apparatus and method for reducing power consumption that does not require removing a disk from the optical disk device.
  • the present invention is based on the inventors' critical observation that power consumption can be reduced in an optical disk drive by determining when a period of inactivity occurs, and then issuing a command to reduce the velocity of the spindle motor which spins the disk medium to the lowest “operational level” or just below the operational level, without completely stopping or “spinning down” the disk for the duration of the inactive period.
  • the “operational level” refers to that angular velocity where the head may still read or write data.
  • a signal is issued from a microprocessor to an actuator to cause a head having read capability to seek to an outer track when a predetermined period of inactivity occurs.
  • This is advantageous because the angular velocity of the disk medium is less at the outer periphery for a given constant linear velocity (the speed measured under the head), and therefore the power consumption of the spindle motor which spins the disk will be less.
  • a reduction of the rotational speed during a period of relative inactivity is accomplished by issuing a control signal from the microprocessor to the spindle control module to reduce the angular velocity of the spindle motor that spins the disk to the lowest operational level or just below the operational level without completely “spinning down” the disk for the duration of the inactive period.
  • CAV constant angular velocity
  • the disk is operational, as it is never completely “spun down” to the point that it stops rotating, with an exception for disks left inactive for large periods of time. So there is no associated significant delay in “spinning up” the disk upon receiving an I/O command.
  • the invention can be used to reduce power consumption of a disk spindle motor while maintaining the disk in an operational mode, or spinning at a speed just below an operational mode.
  • the disk is left inactive for a predetermined time which is significantly long the disk may be stopped from spinning.
  • the stopping of the disk will only follow the event of either moving the head to an outer track for CLV drives, or reducing the angular velocity to the lowest selectable speed for multi-speed CLV and multi-speed CAV drives.
  • FIG. 1 is a block diagram of the present invention
  • FIG. 2 shows a disk medium useful with constant linear velocity type disk drives
  • FIG. 3A is a graph illustrating a critical relationship useful with the present invention.
  • FIG. 3B is a graph illustrating another critical relationship useful with the present invention.
  • FIG. 4 is a flow chart of one embodiment of the present invention.
  • FIG. 5 shows a disk medium useful with constant angular velocity type disk drives
  • FIG. 6 is a flow chart of another embodiment of the present invention.
  • FIG. 7 is a diagrammatic timeline showing a sequence of actions useful for understanding the present invention.
  • Ke is a motor voltage constant dependent on the characteristics of a certain motor type, and ⁇ is the angular velocity of the motor, thus yielding the following helpful relationship:
  • FIG. 1 a general block diagram of an apparatus capable of reducing the power consumed by a disk drive 10 is shown.
  • An optical disk drive is the preferred embodiment; however, the teachings of the present invention are also useful with non-optical disk devices, such as direct access storage devices.
  • the invention is particularly useful in those disk devices employing constant linear velocity (CLV) and constant angular velocity (CAV) control schemes.
  • disk drive 10 could be either of the CLV or CAV type.
  • the invention is also useful with a particular type of CAV disk drive referred to as Zoned Constant Angular Velocity (ZCAV).
  • ZCAV disk drives are CAV drives where the linear density of the recorded data increases incrementally with radius.
  • Microprocessor 12 has its own memory, such as random access memory 13 and read only memory 15 , which is used to store commands and for accomplishing tasks such as “power on” tests.
  • This memory is used to store microcode 14 , which is a set of preprogrammed instructions for carrying out microprocessor functions.
  • microcode 14 is a set of preprogrammed instructions for carrying out microprocessor functions.
  • the inventors envision implementing instructions in microcode within a microprocessor that is part of the disk drive, such as microcode 14 shown as part of microprocessor 12 , which is dedicated to disk drive 10 . It is recognized that applicable instructions could be implemented in other ways, including as an application program written in, for example, the “C” language and operating in control unit 26 which interfaces to disk drive 10 through attaching circuits 27 .
  • the microprocessor 12 communicates with a control unit 26 , which may be a personal computer microprocessor, through attaching circuits 27 , which may be for example a Small Computer Systems Interface (SCSI) card.
  • the microprocessor 12 controls a spindle control module 16 which controls the spindle motor 18 which receives power from power supply 19 .
  • the spindle motor has a rotating element 24 and a disk platter 22 for accommodating and spinning a disk medium, such as disk 30 (FIG. 2 ).
  • the microprocessor also controls an actuator 17 which through a known mechanism controls movement of data read head 23 . Data read from the head is passed through buffer 28 and data circuits 25 to the control unit 26 .
  • the spindle control module 16 and actuator 17 are controlled by microcode 14 in microprocessor 15 according to whether the apparatus is programmed to accommodate constant linear velocity or constant angular velocity schemes.
  • the microprocessor 12 containing microcode 14 , and including the microprocessor's on board RAM 13 and ROM 15 and a clock 11 , form a power savings module 21 for disk drive 10 .
  • a constant linear velocity optical disk drive such as a CD-ROM (Compact Disc-Read Only Memory)
  • a laser head is used as the velocity transducer.
  • a CD-ROM disk 30 employs a single path 32 forming approximately concentric circles, such as circles 33 and 34 .
  • the single path spirals from the center 35 of the disk 30 to its outer periphery 36 .
  • a sector 37 containing data, is logically and physically the same size as all the other sectors on the disk. Although there is actually only one path, each approximately concentric circle is referred to as a track.
  • a phantom radial line “r” is shown extending from the center 35 to the outer periphery 36 .
  • Points r i and r o on the radial line r correspond to an inner radius, starting near the center of the disk, and an outer radius, measured near or at the outer periphery, respectively.
  • the angular velocity of the disk, ⁇ is equal to the angular velocity of a spindle motor which turns it.
  • Track 33 a and 34 a correspond to circles 33 and 34 , respectively.
  • track 33 a is the track closest to the outer periphery of disk 30 .
  • a critical relationship of the radius of a disk to the power consumed by the motor using a CLV disk drive can be better understood.
  • a disk drive e.g. drive 10
  • V Data This speed
  • V Data can also be varied for multi-speed devices; however, once a speed is selected the V Data is held constant as the angular velocity changes.
  • the kinematic, or rotational dynamic relationship is known by the equation:
  • FIG. 3A is a graph plotting angular velocities versus the radius in a multi-speed drive employing a constant linear velocity scheme, to illustrate this point.
  • the points r i and r o correspond to the radial line “r” of FIG. 2.
  • a top curve 38 a shown in FIG. 3A, plots the inverse relationship of the angular velocity, ⁇ , to the increasing radius at the higher speed setting of a multi-speed CLV drive.
  • a lower curve 38 b plots the identical relationship, but at lower magnitudes, for a lower speed setting on a multi-speed CLV drive. This relationship can be related to power consumption, since it is known that
  • the inventors having recognized that this principal may be implemented to reduce power consumption in a disk drive have invented an automatic method and apparatus to take advantage of the fact that an increase of the radius r to its maximum value reduces the angular velocity and thus the power consumption of the spindle motor in a constant linear velocity disk drive, while leaving the disk drive “operational” or at a speed close to “operational” speed.
  • An operational speed or level is that disk speed at which the head may read or write data to the disk.
  • step 41 coincides with the “powering on” of the disk drive.
  • a “Drive Active” check step 42 is performed by the microprocessor 12 to see if any data is being transferred between the head 23 and disk or between the drive buffer 28 and data circuits 25 .
  • step 42 is performed by control unit 26 to see if any files are currently open (i.e., being read or having data written to them).
  • step 42 is performed continuously until all activity ceases, and when this condition is met the drive is considered “inactive.”
  • the processor checks the clock 11 , to determine if a predetermined time, T 1 , has passed while the drive remains inactive (step 44 ). During this “inactive” time, the drive is still checked for activity. Once a predetermined time has passed, with the drive inactive, then it can be established that the drive “activity level” is below a predetermined reference activity level.
  • the microprocessor 12 sends disk drive 10 into a power saving mode (step 45 ).
  • the inventors recognize that it is also possible to cause the power saving mode to occur if a measured time, t, is less than a predetermined time, T 1 , without deviating from the spirit of the invention.
  • a message is sent from microprocessor 12 to actuator 17 to cause head 23 to seek to the track 33 a , which has the maximum radius measured from disk center 35 (step 45 of FIG. 4 ).
  • the spindle control module 16 being automatically configured to maintain a constant linear velocity (V Data ) compensates by decreasing the angular velocity of spindle motor 18 to the lowest operational level of FIG. 3A (where the horizonal coordinate is r 0 ), as shown in step 45 .
  • V Data constant linear velocity
  • microprocessor 12 then commanding the spindle control module 16 to select the lowest available speed for a multi-speed drive (step 46 ).
  • a simple “seek” command issued by microprocessor 12 is all that is required to access data located elsewhere on the disk.
  • a speed change is associated with the CLV seek, such a change is associated with every “seek” implementation in a CLV device.
  • the drive is still fully operational in the power saving mode.
  • the disk is rotating at a reduced speed when inactive, rather than being “spun down” (i.e., at rest), because a completely spun down disk takes a significant amount of time to be “spun up” to operating speed.
  • the disk may be spun to a level just below operational without stopping in order to save power without departing from the spirit of the invention.
  • CAV constant angular velocity
  • Multi-speed constant angular velocity (CAV) schemes are well known.
  • a spindle motor such as motor 18
  • a tachometer to the motor's rotating element (such as element 24 ) and then digitally encoding the signal.
  • a signal from a motor is compared to a reference signal to determine the rotational or angular velocity of the spindle motor.
  • the velocity of the motor can be controlled by varying the voltage applied to the motor, through a power supply 19 controlled by microprocessor 12 . The result is shown in FIG.
  • a constant angular velocity is maintained regardless of where a head, such as head 23 , is in relation to the radius, which is shown to increase from an inner value “r 1 ”, near the center, to an outer value “r 0 ”, near or at the outer periphery.
  • the top line 39 a represents a higher speed setting for a CAV drive
  • the lower line 39 b represents a lower speed setting for a CAV drive. In either case the angular velocity remains at the same value regardless of the radius at which the head is currently located.
  • a known type of disk 50 which is useful with a CAV disk device is shown. Concentric circles form tracks 53 , which are divided radially into sectors 52 .
  • the disk is controlled by a servo or other type of control module (such as module 16 ) to always spin at the same rate.
  • the disk is typically a magnetic or optical type.
  • Such CAV devices typically allow for automatic selection of a desired speed, for example a high speed might be 3600 RPM and a low speed might be 2400 RPM.
  • the experimental set-up included a Hewlett-Packard C1716T CAV optical disk drive, and a Tektronix AM503 current probe, spun at the indicated RPM values.
  • the voltage applied to the motor was 12 Volts DC, and wattage was calculated using Ohm's law. It can be seen that the reduction in RPM values results in a savings of about 16% ((7.2-6.2)/6.2).
  • the microprocessor 12 implements microcode 14 in order to carry out the process; however, for the sake of simplicity, reference will be made only to the microprocessor action of carrying out the microcode instructions.
  • the microprocessor 12 “Start” step 61 coincides with the powering on of the disk drive.
  • a “Drive Active” check step 62 is performed by the microprocessor 12 to see if data I/O is occurring or if any files are currently open (i.e., being read or having data written to them).
  • Step 62 is performed continuously until all data transfer ceases or all files are closed, and when this condition is met the drive is considered “inactive.”
  • the processor checks the clock 11 , to determine if a predetermined time has passed while the drive remains inactive. As with CLV devices, once a predetermined time has passed in step 64 , with the drive inactive, then it can be established that the drive “activity level” is below a predetermined reference activity level.
  • the microprocessor 12 goes into a power saving mode by reducing the disk angular velocity to the lowest operational speed, as shown in step 66 .
  • a time line 70 shows that a complete device spin-down can be added to the general method of power saving mode described above for either CLV or CAV schemes if the device has been in a power saving mode for a predetermined period of time. This might be implemented, for example, if a computer which uses the disk drive has been left powered on, but is unattended.
  • a device is determined to be an active device as shown in time line segment 72 (segment 72 ).
  • An active device is determined as described above in either step 42 FIG. 4 or step 62 FIG. 6.
  • a device or drive which is inactive (segment 74 ) for T 1 seconds (segment 77 ) is sent into a power saving mode (segment 78 ) where it remains for T LOW seconds (segment 82 ), and then the motor velocity is reduced until the motor stops spinning (segment 83 ).
  • a method and apparatus for saving power in a normal operation mode is combined with an additional savings technique for disks left inactive for a long period of time.
  • Such a method in a preferred embodiment, would be carried out by a microprocessor such as microprocessor 12 , by instructions in microcode, such as microcode 14 .
  • Control unit 26 could also be programmed to perform the method. When the device is needed it can be spun back up to operating speed.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Rotational Drive Of Disk (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Moving Of Head For Track Selection And Changing (AREA)
  • Manufacturing Optical Record Carriers (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Power Sources (AREA)
US08/608,974 1994-06-03 1996-02-29 Power saving method and apparatus for computer disk drives Expired - Lifetime US6512652B1 (en)

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US08/608,974 US6512652B1 (en) 1994-06-03 1996-02-29 Power saving method and apparatus for computer disk drives

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JP (1) JP2858542B2 (hu)
KR (1) KR960001960A (hu)
CN (1) CN1117607A (hu)
AT (1) ATE171299T1 (hu)
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CA2150743A1 (en) 1995-12-04
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TW265431B (hu) 1995-12-11
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HU219935B (hu) 2001-09-28
CA2150743C (en) 2002-11-19

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